﻿/********************************************************************************
** 作者： samfeng
** 创始时间：2012-7-15
** 描述：
** 功能：常用的加解密方法类
*********************************************************************************/
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using TConvert = System.Convert;
using System.Collections;
using System.Text.RegularExpressions;


namespace DBA.Common
{
    public enum DEncryType
    {
        MD5,
        AES,
        SHA256,
        Base64,
        DEC,
        DES
    }

    public class DEncryptHelper
    {
        public static DEncryptBase Get(DEncryType types)
        {
            DEncryptBase decObj = null;
            switch (types)
            {
                case DEncryType.MD5:
                    decObj = new DEncryptHelper().Create<MD5>();
                    break;
                case DEncryType.AES:
                    decObj = new DEncryptHelper().Create<AES>();
                    break;
                case DEncryType.Base64:
                    decObj = new DEncryptHelper().Create<Base64>();
                    break;
                case DEncryType.DEC:
                    decObj = new DEncryptHelper().Create<DEC>();
                    break;
                case DEncryType.DES:
                    decObj = new DEncryptHelper().Create<DES>();
                    break;
                case DEncryType.SHA256:
                    decObj = new DEncryptHelper().Create<SHA256>();
                    break;
            }
            return decObj;
        }

        /// <summary>
        /// 工厂方法，要求加密方法必须继承于DEncryptBase
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        private T Create<T>() where T : DEncryptBase, new()
        {
            return new T();
        }

        /// <summary>
        /// 泛型工厂类，指定加密的KEY
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        private T Create<T>(string key) where T : DEncryptBase, new()
        {
            T t = new T();
            t.Key = key;
            return t;
        }
        




        public class RSACryption
        {
            public RSACryption()
            {
            }


            #region RSA 加密解密

            #region RSA 的密钥产生

            /// <summary>
            /// RSA 的密钥产生 产生私钥 和公钥 
            /// </summary>
            /// <param name="xmlKeys"></param>
            /// <param name="xmlPublicKey"></param>
            public void RSAKey(out string xmlKeys, out string xmlPublicKey)
            {
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                xmlKeys = rsa.ToXmlString(true);
                xmlPublicKey = rsa.ToXmlString(false);
            }
            #endregion

            #region RSA的加密函数
            //############################################################################## 
            //RSA 方式加密 
            //说明KEY必须是XML的行式,返回的是字符串 
            //在有一点需要说明！！该加密方式有 长度 限制的！！ 
            //############################################################################## 

            //RSA的加密函数  string
            public string RSAEncrypt(string xmlPublicKey, string m_strEncryptString)
            {

                byte[] PlainTextBArray;
                byte[] CypherTextBArray;
                string Result;
                RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPublicKey);
                PlainTextBArray = (new UnicodeEncoding()).GetBytes(m_strEncryptString);
                CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
                Result = Convert.ToBase64String(CypherTextBArray);
                return Result;

            }
            //RSA的加密函数 byte[]
            public string RSAEncrypt(string xmlPublicKey, byte[] EncryptString)
            {

                byte[] CypherTextBArray;
                string Result;
                RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPublicKey);
                CypherTextBArray = rsa.Encrypt(EncryptString, false);
                Result = Convert.ToBase64String(CypherTextBArray);
                return Result;

            }
            #endregion

            #region RSA的解密函数
            //RSA的解密函数  string
            public string RSADecrypt(string xmlPrivateKey, string m_strDecryptString)
            {
                byte[] PlainTextBArray;
                byte[] DypherTextBArray;
                string Result;
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPrivateKey);
                PlainTextBArray = Convert.FromBase64String(m_strDecryptString);
                DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
                Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
                return Result;

            }

            //RSA的解密函数  byte
            public string RSADecrypt(string xmlPrivateKey, byte[] DecryptString)
            {
                byte[] DypherTextBArray;
                string Result;
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPrivateKey);
                DypherTextBArray = rsa.Decrypt(DecryptString, false);
                Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
                return Result;

            }
            #endregion

            #endregion

            #region RSA数字签名

            #region 获取Hash描述表
            //获取Hash描述表 
            public bool GetHash(string m_strSource, ref byte[] HashData)
            {
                //从字符串中取得Hash描述 
                byte[] Buffer;
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
                HashData = MD5.ComputeHash(Buffer);

                return true;
            }

            //获取Hash描述表 
            public bool GetHash(string m_strSource, ref string strHashData)
            {

                //从字符串中取得Hash描述 
                byte[] Buffer;
                byte[] HashData;
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
                HashData = MD5.ComputeHash(Buffer);

                strHashData = Convert.ToBase64String(HashData);
                return true;

            }

            //获取Hash描述表 
            public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData)
            {

                //从文件中取得Hash描述 
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                HashData = MD5.ComputeHash(objFile);
                objFile.Close();

                return true;

            }

            //获取Hash描述表 
            public bool GetHash(System.IO.FileStream objFile, ref string strHashData)
            {

                //从文件中取得Hash描述 
                byte[] HashData;
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                HashData = MD5.ComputeHash(objFile);
                objFile.Close();

                strHashData = Convert.ToBase64String(HashData);

                return true;

            }
            #endregion

            #region RSA签名
            //RSA签名 
            public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref byte[] EncryptedSignatureData)
            {

                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

                return true;

            }

            //RSA签名 
            public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref string m_strEncryptedSignatureData)
            {

                byte[] EncryptedSignatureData;

                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

                m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);

                return true;

            }

            //RSA签名 
            public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref byte[] EncryptedSignatureData)
            {

                byte[] HashbyteSignature;

                HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

                return true;

            }

            //RSA签名 
            public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref string m_strEncryptedSignatureData)
            {

                byte[] HashbyteSignature;
                byte[] EncryptedSignatureData;

                HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

                m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);

                return true;

            }
            #endregion

            #region RSA 签名验证

            public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
            {

                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");

                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }

            }

            public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, byte[] DeformatterData)
            {

                byte[] HashbyteDeformatter;

                HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);

                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");

                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }

            }

            public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, string p_strDeformatterData)
            {

                byte[] DeformatterData;

                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");

                DeformatterData = Convert.FromBase64String(p_strDeformatterData);

                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }

            }

            public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, string p_strDeformatterData)
            {

                byte[] DeformatterData;
                byte[] HashbyteDeformatter;

                HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(p_strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");

                DeformatterData = Convert.FromBase64String(p_strDeformatterData);

                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }

            }


            #endregion


            #endregion

        } 

    }
}
